And it wasn't just certain lines that suffered more delays than others, there were also certain times of the year that proved to be worse for TGV travellers.

So if you're taking a TGV train this month (July), don't expect it to be on time.

According to the study, TGV punctuality hits an annual low in July.

Between 2012 and 2015, 10.7 percent of TGVs were late nationwide. This figure rose to 12.8 percent for trains running in July.

In July 2015, 16.43 percent of trains failed to meet their schedule.

March wins the award for the most punctual month, with only 9.23 percent of TGVs running late over the last four years. The last month of summer, August, had a lower risk of late trains (10.06 percent) than the annual average.

The calculations were based on the SNCF's own data on punctuality.

The company records all delays of more than five minutes for journeys of less than ninety minutes, of more than 10 minutes for journeys between 90 minutes and three hours, and of more than 15 minutes for journeys longer than three hours.